wuzzzer Posted February 26, 2012 Share Posted February 26, 2012 I had my wife search for an SPL meter app on her phone and she found one that I used today. I wanted to balance my speakers and sub and when I ran the app it measured my sub lower than my speakers. I bumped the sub output slightly to balance it out and after doing it I listened to some music and it sounds much better. I had adjusted everything by ear before. The meter didn't have a 'weighting' adjustment but it did have a slow/medium/fast adjustment. I put it to slow when I measured. Quote Link to comment Share on other sites More sharing options...
Hifi jim Posted February 26, 2012 Share Posted February 26, 2012 I found a great SPL meter app for my iPod Touch. It has a weighted adjustment and a slow/fast switch. It works very well and has an old school looking analog meter that can record peak SPLs. Wonderous times these are. Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted February 26, 2012 Author Share Posted February 26, 2012 What exactly is the 'weighted' adjustment? Quote Link to comment Share on other sites More sharing options...
Greg Oshiro Posted February 26, 2012 Share Posted February 26, 2012 What exactly is the 'weighted' adjustment? Weighting is the frequency response of a filter between the microphone and the detector/display: http://en.wikipedia.org/wiki/File:Acoustic_weighting_curves_(1).svg If you are balancing subs with the rest of the system, The best weighting is *no* weighting. Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted February 26, 2012 Moderators Share Posted February 26, 2012 Wuzzer, Michael Colter has one on his phone that does way more than a Db meter, it actually shows kind of like a graph from low freq to high constantly moving up and down, individual bars. I don't know what kind of phone he has or what it's called but it was not expensive at all. Send him a message and ask I am sure you would love it. He showed it to me but I couldn't get it because I am the last person left on earth without a phone. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted February 28, 2012 Share Posted February 28, 2012 The application is called "RTA", an iphone app. I use it and it does provide a useable real time frequency vs db display. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted February 28, 2012 Share Posted February 28, 2012 Here is a quick snapshot of a frequency response. Quote Link to comment Share on other sites More sharing options...
seti Posted February 28, 2012 Share Posted February 28, 2012 How good is the mic in an iphone? Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted February 28, 2012 Share Posted February 28, 2012 According to the web page use the internal ipod microphone with a "grain of salt", they try to generally calibrate the software to what an average iphone microphone responds to. They have upgraded hardware avalaible on their web page which allows you to calibrate an external microphone. But for the $5 spent it's a fun tool to use. I tuned my system with my calibrated SPL meter, then compared that to what I got on the RTA software, so gave me what to aim for in speaker balance. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted February 28, 2012 Share Posted February 28, 2012 I use Audiotool for the Android. They may have it for apple too. Very good spl, rta, tone genera to, etc. Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted February 29, 2012 Moderators Share Posted February 29, 2012 The application is called "RTA", an iphone app. I use it and it does provide a useable real time frequency vs db display. That's what it looks like, very cool, how accurate, I have no clue? Is there a way to plug in a external mic to a phone ? Quote Link to comment Share on other sites More sharing options...
garyrc Posted February 29, 2012 Share Posted February 29, 2012 http://en.wikipedia.org/wiki/File:Acoustic_weighting_curves_(1).svg If you are balancing subs with the rest of the system, The best weighting is *no* weighting. I used to think that "C" weighting was flat ..... but, of course, it would not be called "weighting" if it wasn't "weighting" (I hope). How do I get "no weighting?" I'd like to see what Audyssey is really doing in my room from the main listening position. I'm considering setting up Room EQ Wizard to find out --- do they have a way to measure without any weighting at all? Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 29, 2012 Share Posted February 29, 2012 The only SPL cell phone app in my house is when my wife stuffs my old "brick" phone in my ear when the music is too loud and she does not want to damage the frying pans or rolling pins.....[] Quote Link to comment Share on other sites More sharing options...
Mighty Favog Posted February 29, 2012 Share Posted February 29, 2012 Here's a shot of RTA Pro I use on my Android based Motorola Milestone 720. Quote Link to comment Share on other sites More sharing options...
Mighty Favog Posted February 29, 2012 Share Posted February 29, 2012 Then another called Spectral Pro: Quote Link to comment Share on other sites More sharing options...
Mighty Favog Posted February 29, 2012 Share Posted February 29, 2012 ...and one more of SPL Meter Free V2.8 (refreshes too fast to read): Quote Link to comment Share on other sites More sharing options...
seti Posted February 29, 2012 Share Posted February 29, 2012 iphone4 internal mic freq response http://blog.faberacoustical.com/2010/ios/iphone/iphone-4-audio-and-frequency-response-limitations/ Compared to Behringer ECM8000. Common mic used for measurements. Not sure why they don't show the low end as it reportedly can measure down to 15hz. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted March 3, 2012 Share Posted March 3, 2012 You can see the iphone microphone response, the RTA pro does it best to calibrate the low frequencies, but with reduced signal it can only do so good. Yes, go to http://www.studiosixdigital.com/iaudiointerface2/, this is the external adapter for a microphone. It is a bit pricey at $400, costing a bit more than what a PC based software and hardware system for a laptop would cost. But you get the functionality of the portability of using your iphone instead of have to lug around a laptop. It is being released this month, I would wait and see if the price comes down in the coming months. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted March 3, 2012 Share Posted March 3, 2012 Has anyone else use an external micorphone on an iphone4? Maybe something like this: http://tascam.com/product/im2/ Quote Link to comment Share on other sites More sharing options...
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